Sungkyunkwan University · Energy
Professor Young-Uk Kwon's research lab specializes in the design, synthesis, and characterization of advanced nanomaterials for sustainable energy and environmental applications. Key research directions include the development of high-performance electrocatalysts for fuel cells and hydrogen production, the rational engineering of mesoporous and hybrid nanostructures for enhanced catalytic and optoelectronic properties, and the exploration of metal-organic frameworks (MOFs) and metal oxide materials for carbon capture and high-temperature CO₂ sequestration. The lab employs advanced synthesis techniques such as ultrasound-assisted polyol processes, electrochemical deposition, and templated sol-gel methods to achieve precise control over nanostructure, composition, and surface properties.
Figures are computed from collected data and may differ slightly.
We report the syntheses and characterization of ternary nanoparticles of Fe<italic>x</italic>@(PtRu)<sub>(1−x)/2</sub>(<italic>x</italic>= 0.0–0.44) with Fe cores and PtRu alloy shells, which exhibit greatly improved electrocatalytic properties for methanol oxidation reaction.
A mesoporous silica film acts as a template and a potential equalizer between the edge/defect sites and the basal plane of a graphene sheet. Using an electrochemical deposition method of CdSe on these graphene sheets covered with a silica film results in CdSe quantum dots that are evenly distributed in regular hexagonal arrays (see figure).
Controlled aging of TiO2 nanoparticles blended with diblock copolymers and processed into dip-coated thin films led to ordered mesostructures with cubic and hexagonal symmetries that can be transformed into mesoporous TiO2 by calcination.
In order to realize carbon capture and sequestration (CCS), a technology proposed to circumvent the global warming problem while maintaining the present level of economic activity, the development of efficient carbon-capturing agents is of prime importance. In addition to the prevailing amine-based agents that operate at temperatures lower than 200 °C, agents that can operate at higher temperatures are being considered to reduce the cost of CCS. For the mid-temperature (200-500 °C) operation, al
Ni(OAc)(2)-H(3)BTC system in various ionic liquids, [RMI]X (R = ethyl, n-propyl, n-butyl; X = Cl, Br, I), produced five MOFs in two structure types; their relative thermodynamic stability varies with the size of RMI(+), and the X(-) ions govern the kinetic factors so that their combination effects determine the final product.
2–3 nm sized Pt3Co nanoparticles (NPs) with Pt-enriched shells on a carbon support were prepared by a one-step ultrasound polyol process on Pt(acac)2 (acac = acetylacetonate) and Co(acac)2. The ultrasound facilitates the conversion of Co(acac)2 and retards the conversion of Pt(acac)2 into NPs, which can be explained with the different vapour pressures of the metal precursors. The Pt-enriched shell structure of the NPs by this method, as opposed to the alloy-like elemental distribution of the NPs
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe zirconium-tin system, with particular attention to the Zr5Sn3-Zr5Sn4 region and Zr4SnYoung Uk Kwon and John D. CorbettCite this: Chem. Mater. 1990, 2, 1, 27–33Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 January 1990https://pubs.acs.org/doi/10.1021/cm00007a005https://doi.org/10.1021/cm00007a005research-articleACS PublicationsRequest reuse permissionsArticle Views349Altmetric-Citations50LE
Hydrothermal reactions in the V(2)O(5)-SeO(2)-AOH systems (A = Na, K, Rb, Cs, NH(4)) were studied with various reagent mole ratios. Typical millimole ratios were V(2)O(5)/SeO(2)/AOH = 5 or 3/15/x in 10-mL aqueous solutions, where x was 5, 10, 15, and 20. The reactions with x = 5 for A = K, Rb, Cs, and NH(4) at 230 degrees C produced single-phase products of the general formula AV(3)Se(2)O(12) with the (NH(4))(VO)(3)(SeO(3))(2) structure type. The x = 15 reactions for A = Rb and Cs yielded AVSeO(
We have synthesized anatase nanocrystals of 8–15 nm containing lattice and surface doping tungsten through hydrothermal reactions. We used phosphotungstate–titania nanocomposites with various compositions as the reagents. The homogeneous distribution of tungsten in the reagent solids appears to strongly influence the synthesis results. X-Ray diffraction and Raman spectroscopy data showed that the samples contained brookite impurities when the tungsten content was low (up to W/(W + Ti) = 3.7%) bu
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